Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Elfdalian
um
←
Proto-Germanic
*umbi
(inherited)
←
Old Norse
um
(inherited)
←
Swedish
om
(cognate)
→
Westrobothnian
öm
(cognate)